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| 型號(hào)： | P95020ZLLGI |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA124 |
| 封裝： | LLGA-124 |
| 文件頁(yè)數(shù)： | 137/137頁(yè) |
| 文件大小： | 3533K |
| 代理商： | P95020ZLLGI |
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P95020 / Preliminary Datasheet
Revision 0.7.10
99
2010 Integrated Device Technology, Inc.
TSC
– MEASURING TOUCH SCREEN PRESSURE (Z1/Z2)
The user can configure whether pressure measurements will be taken by writing to the Pressure Measure Control bits in
the TSC Configuration Register. When measuring touch screen pressure, two parameters (Z1 and Z2) are measured
automatically. Along with the X/Y measurement, these values can be used to calculate the touch-resistance (RTOUCH) with
a formula such as:
1
2
4096
Z
X
R
PLATE
X
TOUCH
Where RX-PLATE is the X-plate panel resistance.
ADC
Y+
Y-
X-
X+
GND
REF-
REF+
VDD
R-touch
ADC
Y+
Y-
X-
X+
GND
REF-
REF+
VDD
R-touch
Measure Z1-Position
Measure Z2-Position
12.3.2
GENERAL PURPOSE ADC MODE
In this mode, GPIO6/7/8/9 are analog general purpose auxiliary signal inputs ADC1/ADC3/ADC2/ADC0. There are also
other four internal signals connect to ADC input multiplexer: BAT, TEMP, VSYS and ICHRG. Those signals are for battery
voltage, die temperature, system voltage and charging current measurement.
ADC AUTO POWER DOWN MODE
In this mode, the ADC and internal reference is usually off. When a measurement is either scheduled by internal timer or
external request, the device powers up the ADC and internal reference, and waits for the internal reference to settle. Then
the signal acquisition starts. The ADC and the reference will be powered down after all the outstanding
scheduled/requested tasks are finished. All the measurement channels will be served in a round robin manner.
ADC ALWAYS ON MODE
In this mode, the ADC is always powered up and the internal ADC reference is always on. The internal reference remains
fully powered after completing a sequence. All the measurement channels will be served in a round robin manner.
12.3.3
SYSTEM MONITORING AND ALERT GENERATION
There are four internal channels support scheduled measurement and monitoring:
Battery voltage (VBAT) measurement
Die Temperature (VTEMP) measurement
Vsys Level (VSYS) measurement
Battery charging current (CHRG_ICHRG) measurement
Among those, three of them are with alert signal generation:
Battery voltage
Die temperature
Vsys level
Measured results are saved in dedicated result registers and compared with pre-defined spec limits. If it is out of the limit,
an alert (map to processor interrupt) signal can be asserted and alert status will be set.
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